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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

#ifndef SRC_NODE_BUFFER_H_

#define SRC_NODE_BUFFER_H_

#include "node.h"

#include "v8.h"

namespace node {

namespace Buffer {

static const unsigned int kMaxLength = v8::TypedArray::kMaxLength;

typedef void (*FreeCallback)(char* data, void* hint);

NODE_EXTERN bool HasInstance(v8::Local<v8::Value> val);

NODE_EXTERN bool HasInstance(v8::Local<v8::Object> val);

NODE_EXTERN char* Data(v8::Local<v8::Value> val);

NODE_EXTERN char* Data(v8::Local<v8::Object> val);

NODE_EXTERN size_t Length(v8::Local<v8::Value> val);

NODE_EXTERN size_t Length(v8::Local<v8::Object> val);

// public constructor - data is copied

NODE_EXTERN v8::MaybeLocal<v8::Object> Copy(v8::Isolate* isolate,

const char* data,

size_t len);

// public constructor

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate, size_t length);

// public constructor from string

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,

v8::Local<v8::String> string,

enum encoding enc = UTF8);

// public constructor - data is used, callback is passed data on object gc

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,

char* data,

size_t length,

FreeCallback callback,

void* hint);

// public constructor - data is used.

NODE_EXTERN v8::MaybeLocal<v8::Object> New(v8::Isolate* isolate,

char* data,

size_t len);

// Creates a Buffer instance over an existing ArrayBuffer.

NODE_EXTERN v8::MaybeLocal<v8::Uint8Array> New(v8::Isolate* isolate,

v8::Local<v8::ArrayBuffer> ab,

size_t byte_offset,

size_t length);

// This is verbose to be explicit with inline commenting

static inline bool IsWithinBounds(size_t off, size_t len, size_t max) {

// Asking to seek too far into the buffer

// check to avoid wrapping in subsequent subtraction

if (off > max)

return false;

// Asking for more than is left over in the buffer

if (max - off < len)

return false;

// Otherwise we're in bounds

return true;

}

} // namespace Buffer

} // namespace node

#endif // SRC_NODE_BUFFER_H_

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